| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M -- |
| -- -- |
| -- S p e c -- |
| -- (OpenVMS DEC Threads Version) -- |
| -- -- |
| -- Copyright (C) 1992-2003 Free Software Foundation, Inc. -- |
| -- -- |
| -- This specification is derived from the Ada Reference Manual for use with -- |
| -- GNAT. The copyright notice above, and the license provisions that follow -- |
| -- apply solely to the contents of the part following the private keyword. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 2, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; see file COPYING. If not, write -- |
| -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, USA. -- |
| -- -- |
| -- As a special exception, if other files instantiate generics from this -- |
| -- unit, or you link this unit with other files to produce an executable, -- |
| -- this unit does not by itself cause the resulting executable to be -- |
| -- covered by the GNU General Public License. This exception does not -- |
| -- however invalidate any other reasons why the executable file might be -- |
| -- covered by the GNU Public License. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| package System is |
| pragma Pure (System); |
| -- Note that we take advantage of the implementation permission to |
| -- make this unit Pure instead of Preelaborable, see RM 13.7(36) |
| |
| type Name is (SYSTEM_NAME_GNAT); |
| System_Name : constant Name := SYSTEM_NAME_GNAT; |
| |
| -- System-Dependent Named Numbers |
| |
| Min_Int : constant := Long_Long_Integer'First; |
| Max_Int : constant := Long_Long_Integer'Last; |
| |
| Max_Binary_Modulus : constant := 2 ** Long_Long_Integer'Size; |
| Max_Nonbinary_Modulus : constant := Integer'Last; |
| |
| Max_Base_Digits : constant := Long_Long_Float'Digits; |
| Max_Digits : constant := Long_Long_Float'Digits; |
| |
| Max_Mantissa : constant := 63; |
| Fine_Delta : constant := 2.0 ** (-Max_Mantissa); |
| |
| Tick : constant := 0.01; |
| |
| -- Storage-related Declarations |
| |
| type Address is private; |
| Null_Address : constant Address; |
| |
| Storage_Unit : constant := 8; |
| Word_Size : constant := 32; |
| Memory_Size : constant := 2 ** 32; |
| |
| -- Address comparison |
| |
| function "<" (Left, Right : Address) return Boolean; |
| function "<=" (Left, Right : Address) return Boolean; |
| function ">" (Left, Right : Address) return Boolean; |
| function ">=" (Left, Right : Address) return Boolean; |
| function "=" (Left, Right : Address) return Boolean; |
| |
| pragma Import (Intrinsic, "<"); |
| pragma Import (Intrinsic, "<="); |
| pragma Import (Intrinsic, ">"); |
| pragma Import (Intrinsic, ">="); |
| pragma Import (Intrinsic, "="); |
| |
| -- Other System-Dependent Declarations |
| |
| type Bit_Order is (High_Order_First, Low_Order_First); |
| Default_Bit_Order : constant Bit_Order := Low_Order_First; |
| |
| -- Priority-related Declarations (RM D.1) |
| |
| Max_Priority : constant Positive := 30; |
| Max_Interrupt_Priority : constant Positive := 31; |
| |
| subtype Any_Priority is Integer range 0 .. 31; |
| subtype Priority is Any_Priority range 0 .. 30; |
| subtype Interrupt_Priority is Any_Priority range 31 .. 31; |
| |
| Default_Priority : constant Priority := 15; |
| |
| private |
| |
| type Address is mod Memory_Size; |
| Null_Address : constant Address := 0; |
| |
| -------------------------------------- |
| -- System Implementation Parameters -- |
| -------------------------------------- |
| |
| -- These parameters provide information about the target that is used |
| -- by the compiler. They are in the private part of System, where they |
| -- can be accessed using the special circuitry in the Targparm unit |
| -- whose source should be consulted for more detailed descriptions |
| -- of the individual switch values. |
| |
| AAMP : constant Boolean := False; |
| Backend_Divide_Checks : constant Boolean := False; |
| Backend_Overflow_Checks : constant Boolean := False; |
| Command_Line_Args : constant Boolean := True; |
| Configurable_Run_Time : constant Boolean := False; |
| Denorm : constant Boolean := False; |
| Duration_32_Bits : constant Boolean := False; |
| Exit_Status_Supported : constant Boolean := True; |
| Fractional_Fixed_Ops : constant Boolean := False; |
| Frontend_Layout : constant Boolean := False; |
| Functions_Return_By_DSP : constant Boolean := False; |
| Machine_Overflows : constant Boolean := False; |
| Machine_Rounds : constant Boolean := True; |
| OpenVMS : constant Boolean := True; |
| Signed_Zeros : constant Boolean := True; |
| Stack_Check_Default : constant Boolean := True; |
| Stack_Check_Probes : constant Boolean := True; |
| Support_64_Bit_Divides : constant Boolean := True; |
| Support_Aggregates : constant Boolean := True; |
| Support_Composite_Assign : constant Boolean := True; |
| Support_Composite_Compare : constant Boolean := True; |
| Support_Long_Shifts : constant Boolean := True; |
| Suppress_Standard_Library : constant Boolean := False; |
| Use_Ada_Main_Program_Name : constant Boolean := False; |
| ZCX_By_Default : constant Boolean := True; |
| GCC_ZCX_Support : constant Boolean := False; |
| Front_End_ZCX_Support : constant Boolean := True; |
| |
| -- Obsolete entries, to be removed eventually (bootstrap issues!) |
| |
| High_Integrity_Mode : constant Boolean := False; |
| Long_Shifts_Inlined : constant Boolean := False; |
| |
| -------------------------- |
| -- Underlying Priorities -- |
| --------------------------- |
| |
| -- Important note: this section of the file must come AFTER the |
| -- definition of the system implementation parameters to ensure |
| -- that the value of these parameters is available for analysis |
| -- of the declarations here (using Rtsfind at compile time). |
| |
| -- The underlying priorities table provides a generalized mechanism |
| -- for mapping from Ada priorities to system priorities. In some |
| -- cases a 1-1 mapping is not the convenient or optimal choice. |
| |
| -- For DEC Threads OpenVMS, we use the full range of 31 priorities |
| -- in the Ada model, but map them by compression onto the more limited |
| -- range of priorities available in OpenVMS. |
| |
| -- To replace the default values of the Underlying_Priorities mapping, |
| -- copy this source file into your build directory, edit the file to |
| -- reflect your desired behavior, and recompile with the command: |
| |
| -- $ gcc -c -O3 -gnatpgn system.ads |
| |
| -- then recompile the run-time parts that depend on this package: |
| |
| -- $ gnatmake -a -gnatn -O3 <your application> |
| |
| -- then force rebuilding your application if you need different options: |
| |
| -- $ gnatmake -f <your options> <your application> |
| |
| type Priorities_Mapping is array (Any_Priority) of Integer; |
| pragma Suppress_Initialization (Priorities_Mapping); |
| -- Suppress initialization in case gnat.adc specifies Normalize_Scalars |
| |
| Underlying_Priorities : constant Priorities_Mapping := |
| |
| (Priority'First => 16, |
| |
| 1 => 17, |
| 2 => 18, |
| 3 => 18, |
| 4 => 18, |
| 5 => 18, |
| 6 => 19, |
| 7 => 19, |
| 8 => 19, |
| 9 => 20, |
| 10 => 20, |
| 11 => 21, |
| 12 => 21, |
| 13 => 22, |
| 14 => 23, |
| |
| Default_Priority => 24, |
| |
| 16 => 25, |
| 17 => 25, |
| 18 => 25, |
| 19 => 26, |
| 20 => 26, |
| 21 => 26, |
| 22 => 27, |
| 23 => 27, |
| 24 => 27, |
| 25 => 28, |
| 26 => 28, |
| 27 => 29, |
| 28 => 29, |
| 29 => 30, |
| |
| Priority'Last => 30, |
| |
| Interrupt_Priority => 31); |
| |
| ---------------------------- |
| -- Special VMS Interfaces -- |
| ---------------------------- |
| |
| procedure Lib_Stop (I : in Integer); |
| pragma Interface (C, Lib_Stop); |
| pragma Import_Procedure (Lib_Stop, "LIB$STOP", Mechanism => (Value)); |
| -- Interface to VMS condition handling. Used by RTSfind and pragma |
| -- {Import,Export}_Exception. Put here because this is the only |
| -- VMS specific package that doesn't drag in tasking. |
| |
| end System; |
